Jürgen Neuberg

University of Leeds

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Mark Thomas

University of Leeds

A. D. Jolly

United States Geological Survey

Richard Luckett

British Geological Survey

Amy Collinson

University of Leeds

Karen Pascal

Montserrat Volcano Observatory

P. E. Malin

Applied Spectral Imaging (United States)

G. S. Mattioli

The University of Texas at Arlington

B. Voight

Pennsylvania State University

E. Shalev

Duke University

A. T. Linde

Carnegie Institution for Science

Cooperative Institutions

University of Leeds

Montserrat Volcano Observatory

Centre National de la Recherche Scientifique

University of Bristol

GNS Science

Pennsylvania State University

United States Geological Survey

University of Cambridge

Istituto Nazionale di Geofisica e Vulcanologia

British Geological Survey

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Effects of volcano topography on seismic broad-band waveforms

Geophysical Journal International (2000)

Jürgen Neuberg Tim Pointer

Volcano seismology often deals with rather shallow seismic sources and seismic stations deployed in their near field. The complex stratigraphy on volcanoes and near-field source effects have a strong impact on the seismic wavefield, complicating the interpretation techniques that are usually employed in earthquake seismology. In addition, as most volcanoes have a pronounced topography, the interference of the seismic wavefield with the stress-free surface results in severe waveform perturbations that affect seismic interpretation methods. In this study we deal predominantly with the surface effects, but take into account the impact of a typical volcano stratigraphy as well as near-field source effects. We derive a correction term for plane seismic waves and a plane-free surface such that for smooth topographies the effect of the free surface can be totally removed. Seismo-volcanic sources radiate energy in a broad frequency range with a correspondingly wide range of different Fresnel zones. A 2-D boundary element method is employed to study how the size of the Fresnel zone is dependent on source depth, dominant wavelength and topography in order to estimate the limits of the plane wave approximation. This approximation remains valid if the dominant wavelength does not exceed twice the source depth. Further aspects of this study concern particle motion analysis to locate point sources and the influence of the stratigraphy on particle motions. Furthermore, the deployment strategy of seismic instruments on volcanoes, as well as the direct interpretation of the broad-band waveforms in terms of pressure fluctuations in the volcanic plumbing system, are discussed.

10.1046/j.1365-246x.2000.00251.x

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Citations (109)

Detailed investigation of a spot on the core mantle boundary using digital PcP data

Physics of The Earth and Planetary Interiors (1991)

Jürgen Neuberg John Wahr

Seismogram

Core–mantle boundary

Coda

Reflector (photography)

Multitaper

10.1016/0031-9201(91)90013-8

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Citations (41)

Low-frequency seismic events in a wider volcanological context

AGUFM (2006)

Jürgen Neuberg Marielle Collombet

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Crystals, Bubbles and Melt: Critical Conduit Processes Revealed by Numerical Models

Advances in volcanology (2018)

Mark Thomas Jürgen Neuberg Amy Collinson

Understanding how magma moves within a conduit is an important question that is still poorly understood. In particular, estimation of the magma ascent rate is key for interpreting monitoring signals and therefore, predicting volcanic activity. This relies on understanding how strongly different magmatic processes occurring within the conduit control the ascent rate. These processes are controlled by changes in magmatic parameters such as the water content or temperature and understanding/linking changes of such parameters to monitoring data is an essential step in the use of these data as a predictive tool. The results presented here are from a suite of conduit flow models based on Soufrière Hills Volcano, Montserrat, that assesses the influence of individual model parameters. By systematically changing these parameters, the results indicate that changes in conduit diameter and excess pressure in the magma chamber are amongst the dominant controlling variables. However, the single most important parameter controlling variations in the magma ascent rate is the volatile content. Therefore, understanding the processes controlling the volatile content within the conduit system and the outgassing of these volatiles is crucial to understanding and predicting potential unrest or eruption scenarios.

Electrical conduit

Outgassing

Unrest

10.1007/11157_2018_36

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The relationship between degassing and rockfall signals at Soufrière Hills Volcano, Montserrat

Geological Society London Memoirs (2002)

Richard Luckett Brian Baptie Jürgen Neuberg

Abstract One of the most common types of seismic event recorded during the eruption of Soufrière Hills Volcano from 1995 to 1999 is known as a rockfall signal because signals recorded when rockfalls were observed on the dome are of this type. Evidence is presented that two seismic sources contributed to these events. The action of falling debris on the dome generated seismicity between 2 Hz and 8 Hz, while many rockfall signals also have a marked spectral peak between 1 Hz and 2 Hz. Deployment of a pressure sensor near the volcano has shown that the 1-2 Hz energy was associated with degassing at the surface of the dome; however, the relative timing of gas escape and seismic signal showed that the first was not the direct source of the second. Resonance of the magma conduit linked to degassing at the surface is invoked as a probable source for the 1-2 Hz seismicity. The relative importance of the two seismic sources that contributed to rockfall signals is examined in the context of the behaviour of the volcano.

Rockfall

10.1144/gsl.mem.2002.021.01.28

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Citations (34)

Prototype PBO instrumentation of CALIPSO project captures world‐record lava dome collapse on Montserrat Volcano

Eos (2004)

G. S. Mattioli S. R. Young B. Voight R. Steven J. Sparks

This article is an update on the status of an innovative new project designed to enhance generally our understanding of andesitic volcano eruption dynamics and, specifically the monitoring and scientific infrastructure at the active Soufrière Hills Volcano (SHV), Montserrat. The project has been designated as the Caribbean Andesite Lava Island Precision Seismo‐geodetic Observatory known as CALIPSO. Its purpose is to investigate the dynamics of the entire SHV magmatic system using an integrated array of specialized instruments in four strategically located ∼200‐m‐deep boreholes in concert with several shallower holes and surface sites. The project is unique, as it represents the first, and only such borehole volcano‐monitoring array deployed at an andesitic stratovolcano.

Stratovolcano

Lava dome

10.1029/2004eo340001

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Citations (26)

Rethinking moment tensor inversion methods to retrieve the source mechanisms of low-frequency seismic events

AGUFM (2011)

Stattegger Karl Jürgen Neuberg

Moment tensor

Earth structure

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Seismic and infrasonic signals associated with an unusual collapse event at the Soufrière Hills volcano, Montserrat

Geophysical Research Letters (2005)

D. N. Green Jürgen Neuberg

In March 2004, during a period of no magma extrusion at Soufrière Hills volcano, Montserrat, an explosive event occurred with little precursory activity. Recorded broadband seismic signals ranged from an ultra‐long‐period signal with a dominant period of 120 s to impulsive, short‐duration events containing frequencies up to 30 Hz. Synthetic displacement functions were fit to the long‐period data after application of the seismometer response. These indicate a shallow collapse of the volcanic edifice occurred, initiated ∼300 m below the surface, lasting ∼100 s. Infrasonic tremor and pulses were also recorded in the 1–20 Hz range. The high‐frequency seismicity and infrasound are interpreted as the subsequent collapse of a gravitationally unstable buttress of remnant dome material which impacted upon the edifice surface. This unique dataset demonstrates the benefits of deploying multi‐parameter stations equipped with broadband instruments.

Seismometer

Microseism

10.1029/2004gl022265

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Citations (27)

Linking spatial and temporal variations in shear stress within a volcanic conduit to observed deformation and seismicity

EGU General Assembly Conference Abstracts (2018)

Luke Marsden Jürgen Neuberg Mark Thomas

Electrical conduit

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